This is a Bachmann HO-Scale E-Z Track Steel 9" Straight Terminal Rerailer with Wire. In addition to making power connections, the terminal rerailer is also designed to correct derailments that sometimes occur during normal railroad operations. Rerailers are installed after difficult sections of track (turnouts, crossings, “S” curves, etc.) where derailments may occur. The terminal rerailer is connected via terminal wires to a power pack, which provides current to power the layout.